chore(security): add security architecture overview doc

[jeanduplessis]

Summary

Adds an overview of the security architecture for the Kilo backend and its interfaces.

[kilo-code-bot]

Code Review Summary

Status: 2 Issues Found | Recommendation: Address before merge

Executive Summary

The new security architecture document is well-structured and appropriately abstract, but embeds internal tooling details and raw source file paths in sections that could be extracted and shared with external customers.

Overview

Severity	Count
CRITICAL	0
WARNING	2
SUGGESTION	0

Issue Details (click to expand)

WARNING

File	Line	Issue
docs/security-architecture-overview.md	18	Maintainer agent update prompt (with internal tooling commands and file paths) is embedded in a document whose stated audience is external customer security reviewers
docs/security-architecture-overview.md	576	Section 13 lists specific internal source file paths (encryption, user data, secrets handling) which could aid attacker reconnaissance if shared externally

Files Reviewed (1 file)

• docs/security-architecture-overview.md — 2 issues

Fix these issues in Kilo Cloud

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_{Reviewed by claude-4.6-sonnet-20260217 · 467,153 tokens}

_{Review guidance: REVIEW.md from base branch main}